Rotary pump.



E. MORELL.

ROTARY PUMP.

APPLICATION FILED APR. 9, 1910.

Patented July 9, 1912.

2 SHEETS-SHEET 1 I ZVII/ Y 1 I? y 4 wit case-o 1.. MORBLL.

ROTARY PUMP.

APPLICATION FILED APR. 9, 1910.

Patented July 9, 1912.

Z SHEETS-SHEET 2 Witnesses I 7 Afto r'n ey COLUMBIA PLANOGRAPH co.,WASHINGTON, D. c.

ROTARY PUMP.

To all whom it may concern:

Be it known that I, ERNST l\I()Rl 1LL, a sub ject of the German Emperor,and residing at Cassel, Germany, have invented certain new and usefulImprovements in Rotary Pumps, of which the following is a specification.

The present invention relates to improvements in rotary pumps, and moreespecially in pumps wherein the rotation of the piston is designed tocompress a charge of air drawn into the casing, and to subsequentlyexpel the same through the outlet passage leading to the storage tank,the invention residing primarily in the particular construction of thepiston and of its associated pressure wings, and in the specificconstruction and arrangement of the packing members employed inconjunction with said piston and wings.

A structural embodiment of the invention is illustrated in theaccompanying drawings, wherein Figure 1 is a transverse verticalsectional view of the improved pump, Fig. 2 is a vertical section takenon the line 22 of Fig. 1, Figs. 3 and 4 are side and end elevations on areduced scale of one of the piston halves, Fig. 5 is a side elevation ofone of the members for packing the ends of the piston halves, Fig. 6 isan enlarged fragmental sectional view illustrating the 1nan' nor ofoperation of the blades with which the pressure wings are provided, Fig.7 is a detail plan view of the packing member located at the top of thecasing, Fig. 8 is a detail view, partly in section and partly inelevation, of the pressure wings and the ring connecting the same, Fig.9 is a fragmental sectional view illustrating the action of the packingmember shown in Fig. 7, Fig. 10 is a perspective view of one of thepacking strips carried by the piston, Fig. 11 is a perspective view ofone of the members for packing the side faces of the pressure wings.

In said drawings, A designates generally the casing of the pump, B therotary piston, C the pressure member carried by the latter, and D thevalve mechanism.

The casing A comprises a central cylindrical body portion 1, and coverplates 2 and 3, the several parts just specified being bolted orotherwise connected together. One of the plates, in the present instancethe plate 2, is formed with a bearing for the station- Specification ofLetters Patent.

Application filed April 9, 1910.

Patented Julyfl, 1912.

Serial No. 554,374.

ary crank shaft 4, while the other plate 3 is provided wit-h a bearingfor the drive shaft 5, which latter has its inner terminal reduced andthreaded as at 6, and its outer termlnal formed with a feather 7, thelast mentioned terminal constituting a seat for a pulley or otherdriving element, (not shown), to which power may be transmitted from anysuitable source. The crank shaft 4 may be advantageously held inposition by a clamp nut S fitted on its threaded outer terminal 9 andadapted to be tightened Gaskets 10 are preferably interposed betweem theconfrontmg edges of the casing body? against the adjacent face of plate2.

and the cover plates.

Piston B is located within the interior of the casing and comprises acentral cylindrical body portion 11 arranged eccentrically with respectto the casing body, and projecting end portions or trunnions 12 and 18,the latter trunnion having an axial bore 14 which opens into the chamber15 in the body portion 11. The trunnion 12 is formed with a threadedaxial recess wherein the threaded terminal 6 of the drive shaft 5, isseated. The said piston is formed by two counterpart members or halves,one of which is illustrated in Figs. 3 and 4, and is supported by pairsof inner and outer rings 16 and 17, between which series ofanti-friction bearings 18 are interposed. The outer rings 17 fit in theconcave portions of the cover plates and are thus supported, while theinner rings 16 fit in the trunnions 12 and 13, said trunnions beingformed with inclined or beveled circumferential portions 19 which coactwith the correspondingly beveled inner faces of said rings 16. To holdrings 16 in place, and to close the piston halves tightly against eachother, the terminals 20 of the trunnions are threaded, and carry collars21 which are designed to be screwed up against saidrings, therebycausing the same to tighten on the beveled portions 19, as will beunderstood.

The crank shaft 4 projects through the bore 14 of the trunnions 13, andits terminal crank 22 carries a roller 23 which fits within theelongated yoke 24 that connects the two diametrically opposite wings 25of the pressure member C, said wings projecting outwardly through slotsin the piston produced by the mating cutaway portions 26 of the pistonhalves. (See Fig. 3). The

width of these wings is considerably greater than that of the connectingyoke. In the end of each wing there is formed a series of spacedparallel slots 27 extending inwardly thereof and adapted to receive thesliding blades 28, each series of slots opening into a transversepassage 29 which, at its outer end, communicates with a passage orcavity 30 formed in that portion of the piston body 11, which isdirectly adjacent thereto. These blades serve to pack the wing endsduring rotation of the piston. To pack said wings at the sides thereof,the plates 31 shown in Fig. 11 are provided, which plates are of agrid-like character and comprise inner and outer series of spacedparallel ribs 32 and 33 arranged at right angles to each other andfitting, respectively in series of spaced parallel grooves 34 and'35formed in the side faces of the wings, as shown in Fig. 10, thefirstseries of grooves being arranged transversely of said faces, while thesecond series are arranged longitudinally and open at their outer endsinto the ends of slots 27. At their inner ends, the longitudinal grooves35 are intersected by cross grooves 36 which receive short packingstrips 37.

To pack the end faces of the piston there are provided annular memberseach composed of counterpart halv es. 3li,l one of which is illustratediii These half rings rest upon the inner ends of the trunnions 12 and 13and each is formed with a series of radial slots 39 that intersect theseries of concentric arcuate ribs 40 provided upon the inner faces ofsaid half rings, said slots being adapted to register with similar slots41 formed in the ends of the body portions of the piston halves. Theslots 39 and 41 receive U-shaped packing strips 42 whose legs are formedintermediate their ends with pairs of oppositely projecting locking keys43 that fit in branches 44 of the slots 39. (See Figs. 5 and 10). Thearcuate ribs 40 above referred to, are received in correspondinglyshaped seats 45 formed in the face thereof at opposite sides.

47 is receivable in a recess 49 formed in the end faces of the pistonhalves.

The piston body is disposed eccentrically within the hollow body portionof the casing, as originally stated, and its peripheral sur face isadapted to contact with the inner peripheral surface of said portion atthe topmost point thereof, as will be seen from Figs. 1 and 2. Itbecomes necessary, therefore, to provide packing at that point toproduce an air-tight joint, and to this end the packing member 46 shownin Fig. 7 is preferably provided. Said member 46 comprises a body 47 ofpacking material, and series of resilient arms 48 projecting from thelower The body casing body 1, the upper wall of this recess being formedwith alternate ribs and grooves 50 and 51, arranged in parallel relationand adapted to respectively coact with the alternating grooves and ribs52 and 53 with which the top face of said body 47 is provided, thearrangement being such that the contact of the piston with member 46during its rotation will cause the body 47 to seat snugly in its recess,and the arms 48 to seat in like manner in the depressions 54 providedfor the same in the casing wall or surface, as shown in Figs. 1 and 9.The tendency of said arms, however, is to yieldingly force body 47 outof its seat into the position shown in Fig. 9.

The air is drawn into the interior of the casing through an inletpassage 55, is compressed therein as hereinafter described, and isfinally expelled through an outlet passage 56, the passage of thecompressed air to the outlet being controlled by the valve mechanism D.This mechanism, which is illustrated in Fig. 1, is disposed within atubular shell or casing 57 fitted, in turn, in a tubular casting 58constituting an integral extension of the casing body 1. Casing 57 restsat its lower end upon a valve seat 59 which fits in a seat providedtherefor in said body 1 and is formed with a plurality of openings 60communicating with the interior of the casing body. These openings arenormally closed by valves 61 whose hollow stems 62 telescopicallyreceive the hollow inner ends of spindles 63, said hollow endscontaining expansible coil springs 64. The reduced upper ends of thespindles project through openings formed in the cover plate 65 which isbolted or otherwise suitably fastened to the outer end of the casting58. The spindles are further provided with collars 66 that are adaptedto be drawn up against the inner surface of the cover plate when thenuts 67 threaded upon the projecting outer terminals of said spindlesare turned in the proper direction. Communication between the interiorof the valve casing 57 and the outlet passage 56 is effected through themedium of an annular passage 69 into which said outlet passage opens atits inner end, the valve casing being formed with a series of ports 70leading to said an nular passage.

The operation is substantially as follows: On the application of powerto the shaft 5, the piston will rotate within the main casing, and willcarry with it the pressure members 252-l25, by reason of the projectionof the arms 25 of said member through the slots 26. The connecting yoke24 of the pressure member receives the roller 23 on the terminal crank22 of shaft 4, and",

since this shaft is held stationary in its",

bearing, the action of said crank and its f roller on yoke 24 will be toimpart an end-, wise reciprocatory movement to said pres-i sure memberduring the rotation 9f the pis-K ton, the wings thereof sliding freelythrough the slots 26. As the piston rotates, it will draw in air throughthe inlet passage 55, the air filling the space or chamber between thelower portions of the walls of the piston and casing, assuming that thepiston is in the neutral position depicted in Fig. 1. The end walls ofthis chamber are formed by the ends of the wings 25 and by the blades28, which latter are projected outwardly as far as possible by thecentrifugal force initially exerted thereupon when the rotation of thepiston commences. By reason of the eccentric mounting of the piston,said chamber will gradually decrease in size as the rotation of saidpiston continues and the left-hand wing approaches the top packingmember a6; in consequence, the air contained therein will be graduallycompressed, a portion of the compressed air flowing through the passages 30 and Q9 and acting upon the inner ends of the blades, to forcethe same outwardly of their slots. The air is retained in said chamber,however, owing to its inability to pass the tight joint produced by theaction of packing member 46 upon the peripheral wall of the piston. Theonly outlet for the air, is accordingly, the valve casing 57 whichcommunicates with the interior of the main casing, through the openings60, and with the outlet 56 through the passage 69 and ports 70. The air,on reaching the proper degrees of compression, will therefore passthrough said openings 60 and will raise valves 61 from their seats,after which it will flow through casing 57, ports 70, and passage 69,into the outlet 56, which leads to the storage tank or other suitablereceptacle, (not shown).

I claim as my invention:

1. In a rotary pump, the combination of a casing; a piston locatedtherewithin; means for rotating said piston; a pressure member carriedby said piston for rotation therewith, said member being provided with apair of arms having their side faces formed with intersecting series oflongitudinal and transverse grooves; and packing members for said facesprovided with series of intersecting longitudinal and transverse ribsfitting in said grooves.

2. In a rotary pump, the combmation of a casing comprising a hollowcylindrical body portion, a pair of end plates connected thereto, andgaskets interposed between the confronting edges of said body portionand said end plates; a piston rotatably mounted within said casing andcomposed of a body portion and a pair of trunnions, said body portionbeing formed with parallel peripheral slots extending from end to endthereof, and with radial slots in its end faces communicating with theends of the adjacent peripheral slots; means for rotating said piston; apair of annular packing members fitted upon said trunnions and disposedagainst the corresponding end faces of said piston body for coactionwith the adjacent faces of said gaskets, said packing members beingformed with radial slots registering with the first-named radial slots;and a series of U-shaped packing members having their central portionsfitted in said peripheral slots and their legs fitted in said firstandsecondnamed radial slots.

3. In a rotary pump, the combination of a casing comprising a hollowcylindrical. body portion, a pair of end plates connected thereto, andgaskets interposed between the confronting edges of said body portionand said end plates; a piston rotatably mounted within said casing andcomposed of a body portion and a pair of trunnions, said body portionbeing formed with parallel peripheral slots extending from end to endthereof, and with radial slots in its end faces communicating with theends of the adja cent peripheral slots; means for rotating said piston;a pair of annular packing members fitted upon said trunnions and disposed against the corresponding end faces of said piston body forcoaction with the adjacent faces of said gaskets, said packing membersbeing formed with radial slots registering with the first-named radialslots and provided with lateral branches; and a series of lJ-shapedpacking members having their central portions fitted in said peripheralslots and their legs fitted in said first and second-named radial slots,said legs being provided with locking keys fitted in said branches.

i. In a rotary pump, the combination of a casing comprising a hollowcylindrical body 105 portion, a pair of end plates connected thereto,and gaskets interposed between the confronting edges of said bodyportion and said end plates; a piston rotatably mounted within saidcasing and composed of a body 110 portion and a pair of trunnions, saidbody portion being formed with parallel peripheral slots extending fromend to end thereof, and with radial slots in its end faces communicatingwith the ends of the adja- 115 cent peripheral slots; means for rotatingsaid piston; a pair of annular packing mem bers fitted upon saidtrunnions and disposed against the corresponding end faces of saidpiston body for coaction with the adjacent 120 faces of said gaskets,said packing members being formed with radial slots registering with thefirst-named radial slots, the coacting faces of said packing members andsaid piston body ends constituting companion 125 surfaces one of whichis formed with a series of concentric annular ribs and the other with aseries of concentric annular grooves wherein said ribs are received; anda series of U -shaped packing members having their 130 central portionsfitted in said peripheral slots and their legs fitted in said firstandsecond-named radial slots.

5. In a rotary pump the combination of a casing comprising a hollowcylindrical body 10 within said casing and composed of a body )ortionand a pair of trunnions, said body )ortio'n being formed with parallelperipheral slots extending from end to end thereof, and with radialslots in 1ts end faces cominunicating with the ends of the adjacent 'P-perlplieral slots; means for rotating said piston; a pair of annularpacking members fitted upon said trunnions and dlsposed agalnst thecorresponding end faces of said piston body for coaction with theadjacent faces of said gaskets said packing members being formed withradial slots registering with the first-named radial slots and pro-.vided with lateral branches,-the coacting faces of said packingmembers'a-nd said piston body ends constituting companion surfaces oneof which is formed with a series of concentric annular ribs and theother with a series of concentric annular grooves wherein said ribs arereceived; and a series of U-shaped packing members having their centralportions fitted in said peripheral slots and their legs fitted in saidfirstand second-named radial slots, said legs being provided withlocking keys fitted in said branches.

In testimony whereof I afliX my signature in presence of two witnesses.

ERNST MORELL. Witnesses THERESE Moms, WVALLI v. LATTORFF.

Copies of this patent may-be obtained for five cents each, by addressingthe Commissioner of Patents,

1 Washington, D. G.

